Radio chassis assembly



July 29, 1952 s. TARANTUR ETAL 2,505,326

RADIO CHASSIS ASSEMBLY Filed Nov' 22, 1949 I 3 Sheets-Sheet 1 INV ToRs 84/? TA/P T F/ 6. Mega/Peg wee/a4 y 29, 1952 s. TARANTUR ETAL 2,605,326

RADIO CHASSIS ASSEMBLY Filed Nov. 22, 1949 3 Sheets-Sheet 2 FIG. 4

July 29, 1952 s. TARANTUR ETAL 2,605,326

RADIO CHASSIS ASSEMBIJY 3 Sheets-Sheet 5 /a Z2 Z2 7 /a 3/ Z0 Z3 Z0 Z3 Z4 37 IN V EN TORS SAM TARA/V TU)? GEORGE HARR/GA/V Patented July 29, 1952 AT S PATENT" OFFICE- assignors to Admiral Corporation, Chicago, Ill., acorporation of Delaware Application November 22, 1949,-Serial a... 128,771"

3 Claims. (01. 175 2 98) This invention relates to improvements in radio chassis assemblies, and more particularly to one where the wiring components are compactly assembled and yet where they are not crowded.

It frequently happens that, because of space limitations, radio receivers are assembled with the tubes in a horizontal position when they are placed in a cabinet with limitations on the space. This in contrast to the normal procedure where a large space and chassis is available to permit easy wiring.

The type of assembly where the tube are horizontal necessitated the wiring of all tube sockets, and the like, from beneath the chassis and within the sides of the box which were usually deep enough to cause difficulty in the assembling and servicing of the radio set.

By our invention, we provide a chassis assembly on which the major components including tubes and controls, and the like, are mounted on a back support. A cover is then provided which encloses the top, sides and front to protect the wiring. Thus, the cover can be removed, and the underside of the tube sockets, wiring components, and the like, are exposed where they can be easilyand quickly serviced should occasion require it. This type of chassis construction is particularly well adapted to the manufacture of tuners and amplifiers. The assembly may then be enclosed in an ornamental front which also encloses the bottom to prevent entrance of dust, dirt or the like to enclose the wiring completely.

A more complete understanding of our invention may be had from reference to the following figures and description which forms a part of this specification.

In the drawings:

Fig. 1 is a front elevational view of our chassis completely assembled except for the ornamental front;

Fig. 2 is a top plan View of the chassis;

Fig. 3 is an exploded end elevational view of the chassis showing the ornamental front;

Fig. 4 is a top plan view of the chassis with the cover removed;

Fig. 5 is a bottom plan view corresponding to Fig. 4; and

Fig. 6 is a top plan view of the front alone with a portion of the dial plate broken away to show the dial cord.

Our invention, broadly, comprises a chassis assembly in which the major radio components are mounted on the back. A cover is provided for this back which is removably attached to a short flange. The cover encloses the top, both ends, and the front of the chassis and preferably carries the dial. The shafts of the controls extend through the cover, and bushings may be provided for support of the shafts. An ornamental front is provided Which covers the dial and also encloses the bottom of the chassis to form a dust proof enclosure.

More specifically, and referring to the drawings, our invention comprises a, chassis formed in two principal parts; the back H, and the cover I2. As best shown in Figs. 4 and 5, the radio components, such as tubes [3, transformers 14, etc., are mounted on the back in a manner customary to those skilled in the art. However, the back is provided with only narrow flanges l5 having holes I6 for the reception of sheet metal screws [1. These screws I1 extend through the cover I2 and into the back H tohold the cover to the back.

The controls, such as switches [8, are mounted on the back of the assembly by means of long screws 20 extending through sleeves 2|. These sleeves are proportioned so that the switch plates 22 are conveniently located. At the end of the screws 20 near the front of the cover I2, detent mechanisms 23 may be provided for the switches. In addition to providing a detent action, these mechanisms include bushings 24 in which the switch shaft 25 is journalled for additional support. A nut 26 may be threaded on these bushings to provide support if desired, but such is wholly unnecessary. The potentiometer controls 28, such as volume control and tone control, may be conveniently mounted on a bracket 23 fixed to the back H in a position such that the shaftsmay. extend through the front of the cover l2.f As before, a nut 26 may be provided but is unnecessaryL The control and indicating mechanism for the tuning of the radio may be most conveniently mounted on the cover l2. The preferred means is best shown in Fig. 1 For this purpose, we prefer to use a cable type mechanism operated by a pulley 32 journalled in a bracket 33 on the front of the cover I2. This pulley is also journalled on one of the switch shafts 25 and may be operated by the outer of a pair of concentric knobs, not shown. Also mounted on the cover [2: by means of brackets 35 is an indicator plate 36 bearing numbers corresponding to the frequenoy to which the set may be tuned. This indicator may be illuminated by a small pilot light 31 at each end thereof. The lights are contained in sockets 30 which may be clipped to the plate 36 by spring clips 3| in a manner well known in 3 the art. On the underside of the plate 36, a flange 38 is formed on which a pointer 39 is slidably journalled.

The cable or cord 40, which operates the pointer 39 and the tuning of the set, passes from a loop around the pulley 32 upward to a sheave 4| journalled on a pin 42 extending from the plate 36, thence to the pointer 39 which is clipped to the cord in a permanent position after proper adjustment. From the pointer, the cord 46 extends to a second sheave 43 journalled on a pin 44 also fixed to the plate 36. The cord then extends around the large control wheel 7 45 which is fixed to the shaft 46 of the variable tuning condenser 49. It is fastened to this wheel by a spring 41 to keep a constant tension in the cord 40 as is well known inthe art. then extends through a third sheave 48. on the plate 36 and back to the pulley 32. It is apparent that turning the pulley- 32 will cause the cord 666 to move the pointer 39 and simultaneously to turn the wheel 45 and thereby tune the variable tuning condenser 49 to the desired frequency.

Since the only part of theforegoing mechanism mounted on the back I l is the wheel 45, the disassembly of the chassis may be easily accomplished. The spring His disengaged from its lug 56 on the wheel 45 and is transferred to a lug 5i struck upwards from the top of the cover E2 in a position such that the cord 49 is under tension when the spring is hooked thereon. Any nuts 26 which have been used and the screws I! are removed, and the cover may be removed from the back leaving all the wiring and underside of tube sockets and the like easily accessible.

An ornamental front 53 (Fig. 3) having a lower lip 56 is provided to enclose thechassis completely and to provide means for attaching the chassis to a larger assembly including, for example, a record player or power supply unit or the like. This front may be slid over the cover 52 allowing the shafts 25 to protrude through openings provided therefor. Since the front is prelerably made of a plastic material, reinforcing pads 65 are provided to prevent cracking around the shafts. I

The front is formed to enclose the cable arrangement and the indicator or dial plate 36 and is provided with a curved transparent plastic window at 56 to allow the indicator to be seen. It is fastened to the chassis at the bottom by screws extending through the lip 54 into holes 55 in the flange I5 on the bottom of the chassis El. fhus, the switches I8 and other parts mounted on the front of the chassis H are completely enclosed in a dust proof housing. Holes 56 are provided to receive screws to attach the chassis to a larger assembly or'to a cabinet.

Thus it can be seen that we have provided a radio chassis assembly which is much easier to wire and to service because of the small flanges required for the attachment of the cover.

Having thus described our invention, we are aware that numerous and extensive departures may be made therefrom without departing from the spirit or scope of the invention.

The. cord We claim:

1. A radio chassis assembly comprising a back on which the major components and controls including a variable condenser are mounted, a wheel mounted on said back adapted to control said variable condenser, a cover releasably attached to said back, cable means controlled from said cover extending around said wheel to turn said wheel, attaching means on said cover, said cable means being readily detachable from said wheel and attached to said attaching means to allow said cover to be removed.

2. A radio receiver comprising in combination, arear chassis for supporting the tubes, transformers and tuning means on the rear side and the necessary switches, resistors, volume controls, condensers and connections on the front side; said chassis being formed with low flanges around its edges; a cover enclosing said front side and forming a box with said chassis; said cover being removably attached to said. flanges; dial and control means mounted on said cover including a cable member, said cable normally extending between said dial and control means and said tuning means; and attaching means on said cover adapted to receive said cable member when released from said tuning means to preserve a tension in'said cable member when said cover is removed.

3. A radio chassis assembly comprising a back on which major components and controls including tuning means are mounted, a wheel on said tuning means adapted to control the tuning thereof, a cover releasably fixed to said back adapted to form a box with said back, dial and control means mounted on said cover, cable means normally connected between said dial and control means and said wheel, spring means releasably engaging said wheel and said cable means to maintain tension in said cable means, said cable means being detachable from said wheel, and said spring. means being attachable to said attaching means, said attaching means being located so as to preserve a tension in said spring means and cable means.

SAM TARAN'IUR. GEORGE HARRIGAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,667,863 Little May 1, 1928 1,804,676 Dalton May 12, 1931 1,835,036 Gehm Dec. 8, 1931 2,154,406 Marholz Apr. 11, 1939 2,185,562 Nielsen Jan. 2, 1940 2,212,315 Bollack Aug. 20, 1940 2,468,727 Bauman May 3, 1949 FOREIGN PATENTS Number Country Date 453,620 Great Britain Sept. 15, 1936 

